AT25DF161-SH ATMEL [ATMEL Corporation], AT25DF161-SH Datasheet - Page 7

• Manufacturer Part Number: AT25DF161-SH
• Description: 8-bit Atmel Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

4.2 I/O expansion headers
8394B-AVR-02/12
NOTE
This however will disable the JTAG interface until the connection is reestablished by,
for example soldering a bridge on the cut-strap.
The Atmel AVR XMEGA-A3BU Xplained headers J1, J2, J3, and J4 offer access to
the I/O of the microcontroller in order to expand the board, for example by mounting a
top module onto the board.
The header J1 offers digital communication interfaces like UART, TWI and SPI.
4-2
When using TWI please note that no pull-ups are mounted on the board from the
factory, so it is required to either enable the internal pull-ups of the device or to mount
the external pull-ups on the available footprints (R200 and R201). Please refer to the
assembly drawing in the design documentation for the location of these footprints.
Table 4-2. Expansion header J1.
The header J2 is connected to analog ports of the XMEGA as shown in
Table 4-3. Expansion header J2.
The I/O connected to the expansion header J3 is shared with on-board features as
sensors and JTAG interface. Therefore care must be taken when J3 is used for
expansions.
Pin on J1
1
2
3
4
5
6
7
8
9
10
Pin on J2
1
2
3
4
5
6
7
8
9
10
shows how the Atmel AVR XMEGA is connected to the header.
Table 4-4
Name on J1
SDA
SCL
RXD
TXD
SS
MOSI
MISO
SCK
GND
VCC_P3V3
Name on J2
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
GND
VCC_P3V3
shows the mapping of the XMEGA I/O to J3.
XMEGA pin
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
-
-
XMEGA pin
PB0
PB1
PB2
PB3
PA4
PA5
PA6
PA7
-
-
Shared with onboard functionality
-
-
-
-
-
-
-
-
-
-
Shared with onboard functionality
-
-
-
-
-
-
-
-
-
-
Atmel AVR1923
Table
4-3.
Table
7